In recent years,there has been a growing interest in real estate investments that utilize blockchain technology.Traditional real estate investments usually involve third-party intermediaries for verifying and recordin...In recent years,there has been a growing interest in real estate investments that utilize blockchain technology.Traditional real estate investments usually involve third-party intermediaries for verifying and recording informal real estate transactions.This paper proposes a blockchain-based real estate investment model and presents a detailed description of the real estate register authentication aspect of the model.The model uses blockchain technology to create tamper-evident records of real estate transactions and provide secure authentication and verification for informal real estate transactions.Meanwhile,each real estate transaction is recorded in a block,and all transaction records are kept on the blockchain.This means that inventors can access these transaction records and verify their authenticity and validity.The system can also use smart contracts to automate the process of real estate transactions,which further improves transaction efficiency and reduces costs.Furthermore,the model’s timestamp and authentication mechanism can eliminate third-party intermediaries and ensure the authenticity and validity of real estate transactions through distributed ledgers and verification mechanisms.Overall,blockchain-based real estate systems offer advantages of security,transparency,efficiency,and cost reduction.With ongoing blockchain advancements,these systems are expected to play a crucial role in future real estate investment transactions.展开更多
针对PTP(precise time protocol)协议在应用层获取软件时间戳导致时钟同步精度下降的问题,提出一种基于MAC(media access control)层获取硬件时间戳的PTP同步优化方案。设计了以STM32F407微处理器为核心的PTP时钟应用平台,在MAC层实现...针对PTP(precise time protocol)协议在应用层获取软件时间戳导致时钟同步精度下降的问题,提出一种基于MAC(media access control)层获取硬件时间戳的PTP同步优化方案。设计了以STM32F407微处理器为核心的PTP时钟应用平台,在MAC层实现了硬件时间戳获取,避免了由于协议栈软件处理延时产生的不确定性;针对PTP时钟晶振老化导致的时间同步偏差及网络延迟抖动问题,采用迭代方法优化了本地时钟频率调节算法,提高了频率校正精度。经实际测试,主从时钟偏差的RMS(root mean square)优于20 ns,提升了时钟同步精度。展开更多
随着高清电视和网络媒体的快速发展,音视频同步技术在广播电视节目制作中的重要性日益突出。通过对当前音视频同步系统的分析,深入研究节目时钟参考(Program Clock Reference,PCR)、显示时间戳(Presentation Time Stamp,PTS)/解码时间戳...随着高清电视和网络媒体的快速发展,音视频同步技术在广播电视节目制作中的重要性日益突出。通过对当前音视频同步系统的分析,深入研究节目时钟参考(Program Clock Reference,PCR)、显示时间戳(Presentation Time Stamp,PTS)/解码时间戳(Decoding Time Stamp,DTS)、音视频缓冲区控制等关键技术在实际制作环境中的应用。基于自适应缓冲区控制的音视频同步方案能将音视频延迟控制在±15 ms以内,满足广播级节目制作要求。展开更多
文摘In recent years,there has been a growing interest in real estate investments that utilize blockchain technology.Traditional real estate investments usually involve third-party intermediaries for verifying and recording informal real estate transactions.This paper proposes a blockchain-based real estate investment model and presents a detailed description of the real estate register authentication aspect of the model.The model uses blockchain technology to create tamper-evident records of real estate transactions and provide secure authentication and verification for informal real estate transactions.Meanwhile,each real estate transaction is recorded in a block,and all transaction records are kept on the blockchain.This means that inventors can access these transaction records and verify their authenticity and validity.The system can also use smart contracts to automate the process of real estate transactions,which further improves transaction efficiency and reduces costs.Furthermore,the model’s timestamp and authentication mechanism can eliminate third-party intermediaries and ensure the authenticity and validity of real estate transactions through distributed ledgers and verification mechanisms.Overall,blockchain-based real estate systems offer advantages of security,transparency,efficiency,and cost reduction.With ongoing blockchain advancements,these systems are expected to play a crucial role in future real estate investment transactions.
文摘针对PTP(precise time protocol)协议在应用层获取软件时间戳导致时钟同步精度下降的问题,提出一种基于MAC(media access control)层获取硬件时间戳的PTP同步优化方案。设计了以STM32F407微处理器为核心的PTP时钟应用平台,在MAC层实现了硬件时间戳获取,避免了由于协议栈软件处理延时产生的不确定性;针对PTP时钟晶振老化导致的时间同步偏差及网络延迟抖动问题,采用迭代方法优化了本地时钟频率调节算法,提高了频率校正精度。经实际测试,主从时钟偏差的RMS(root mean square)优于20 ns,提升了时钟同步精度。
文摘随着高清电视和网络媒体的快速发展,音视频同步技术在广播电视节目制作中的重要性日益突出。通过对当前音视频同步系统的分析,深入研究节目时钟参考(Program Clock Reference,PCR)、显示时间戳(Presentation Time Stamp,PTS)/解码时间戳(Decoding Time Stamp,DTS)、音视频缓冲区控制等关键技术在实际制作环境中的应用。基于自适应缓冲区控制的音视频同步方案能将音视频延迟控制在±15 ms以内,满足广播级节目制作要求。
